Locking device for motors



w. B. SM|-TH AND D. N; SWATZELL.

LOCKING DEVICE FOR MOTORS.

APPLICATION FILED DEC. [4, 1920.

1,888,778. Patented Aug. 23,1921.

ATTORNEY barren. sr-rns PATENT m."

1 WILBURN B. SMITH AND DAVID ivfswnrznnn, or IRMINGHAM, ALA

LOCKING DEVICE FOR IYIOTORS- 7 Specificaticn of Letters Patent. Eatghted A 23 1921 Application filed December 14, 1920. Serial No. 430,697.

To all whom it may concern 4 Be it known that we, WILBURN B. SMITH and DAVID N. SWATZELL, citizens of the bile so that the same cannot be started by unauthorized persons.

In carrying out our invention, We propose to provide a locking dog for engaging with one of the rotary parts of the motor, and to also provide means for locking the dog in such engagement.

It is also our object to build out the case of the fly wheel of an automobile to provide a pocket therein, to form or secure on the periphery of the fly wheel teeth, to arrange in the pocket a pivoted spring influenced dog that has its active face toothed to engage with the teeth of the fly wheel, spring means influencing the dog to such engage ment, and cam means being providedfor swinging the dog out of such engagement, While locking means is provided for said cam means.

The drawings illustrate a satisfactory embodiment of the improvement reduced to practice, and in which z Figure 1 is an elevation, partly in section of the fly wheel case, and the fly wheel of an automobile, and the arrangement of the improvement in the case.

Fig. 2 is a sectional view approximately on the line 2-2 of Fig. 1.

While we have illustrated our improvement in connection with the fly wheel and fly wheel case of an automobile, it is to be understood that the same may be applied with equal efliciency on other rotatable parts of the motor.

Referring now to the drawings in detail, the crank shaft 1 has secured thereto the usual fly wheel 2. In the present instance, the fly wheel 2 is provided with peripheral teeth 8. The teeth 3 may be formed on a cylindrical band which is inserted overthe flywheel and secured thereto in any desired manner, but, of course, the fly Wheel may be integrally formed with the said teeth, if desire The fly wheel case is indicated by the numeral 4: and in carrying out our improvement we form the same'with an outstandng bulged portion 5 which provides, on its interior, a substantially rectangular pocket 6. In this pocket we pivot, as at 7, a dog 8. The dog has its active face arranged on the end thereof opposite the pivot and the said active face is provided with teeth 9that are designed to engage with the teeth 3 of the fly wheel. hen the teeth of the dog are thus engaged with the teeth of the fly wheel,

the latter will, of course, be held against is approximately centrally provided with a cam enlargement 1.8. On one end of the shaft 12 is a lug 13 that is received in a notch 14 in the barrel 15 of a permutation lock. The lock is preferably in the nature of an ordinary pin lock, and the key for operatlng the same is indicated by the numeral 16.

It will be apparent that when the key is turned to revolve the barrel of the lock the shaft 12 will be likewise turned, so that its cam surface 13 may be brought out of en- 'gagement with the inwardly inclined edge 17 of the dog 8, thus permitting the spring 10 to force the toothed surface of the dog into engagement with the teeth 8 of the fly wheel 2. When the lock is operated to turn the shaft 12 in an opposite direction, the cam 13 will ride on to the inner edge 17 of the dog, thus elevating the same in the pocket 6 against the pressure of the spring 10, and bringing the dog out of engagement with the fly wheel to permit of the operation of the motor.

Having thus described the invention, what we claim, is

In combination with the fly wheel of a motor, provided with peripheral teeth and a fiy case in which the wheel is housed, and said motor having an outwardly extended portion providing a pocket therein; of a dog 5 pivotally secured in the pocket having a toothed end for engaging with the teeth of I the fly wheel, spring means for influencing the dog to such engagement, 2L shaft ournaled transversely 1n the housing below the 10 dog, a cam surface thereon in the path of engagement with the inner ed e of the dog, a lug on one end of the she t,' and a lock including a. rotary fbarrel which has a notched end in Which the lug of the shaft is received.

In testimony whereof we, affix our signatures.

WILBURN B. SMITH. DAVID N. SWATZELL. 

